Hi just like to say hello and let people know about my projects for older micros and the website where info is ...

https://sites.google.com/site/gogleoops

It is still very much under construction.. have partial info on a TMS9995 micro and expansion so far and a SYM-1 mini board running a monitor though a serial(USB) port. Have info about pcbs for these ..still to come ...

Thanks for bringing your site to our attention, chessdoger! I think your page on building a keypad might be of special interest, as it's an authentic and more or less convenient form of input for a single board machine:
https://sites.google.com/site/gogleoops ... pad-design